fn main(){
    let a = 2;
    let b = 3;
    let c = a + b;
    let d = a - b;
    let e = a * b;
    let f = a / b;
    let g = a % b;
    println!("c = a + b = {}", c);
    println!("d = a - b = {}", d);
    println!("e = a * b = {}", e);
    println!("f = a / b = {}", f);
    println!("g = a % b = {}", g);
}